y=3-2tgx
y'=-2/(cosx)^2
y'(-pi)=-2/(cos(-pi))^2=-2/1^2=-2
(3-2tgx)¹=-2/cos²x
x₀=-π, y¹(-π)= -2/cos²(-π)= -2/cos²π=-2/(-1)²= -2
y=3-2tgx
y'=-2/(cosx)^2
y'(-pi)=-2/(cos(-pi))^2=-2/1^2=-2
(3-2tgx)¹=-2/cos²x
x₀=-π, y¹(-π)= -2/cos²(-π)= -2/cos²π=-2/(-1)²= -2